14 (fourteen) is a natural number following 13 and succeeded by 15.

In relation to the word "four" (4), 14 is spelled "fourteen".

Look up fourteen in Wiktionary, the free dictionary.

In mathematics[edit]

• 14 is a composite number.^[1]
• 14 is a square pyramidal number.
• 14 is a stella octangula number.
• In hexadecimal, fourteen is represented as E
• Fourteen is the lowest even n for which the equation φ(x) = n has no solution, making it the first even nontotient (see Euler's totient function).^[2]
• Take a set of real numbers and apply the closure and complement operations to it in any possible sequence. At most 14 distinct sets can be generated in this way.
  • This holds even if the reals are replaced by a more general topological space. See Kuratowski's closure-complement problem
• 14 is a Catalan number.^[3]
• Fourteen is a Companion Pell number.^[4]
• According to the Shapiro inequality 14 is the least number n such that there exist x₁, x₂, ..., x_n such that

{\displaystyle \sum _{i=1}^{n}{\frac {x_{i}}{x_{i+1}+x_{i+2}}}{\frac {n}{2}}}

where x_{n + 1} = x₁, x_{n + 2} = x₂.

• There are fourteen possible Bravais lattices that fill three-dimensional space.

In science[edit]

Chemistry[edit]

• The atomic number of silicon
• The approximate atomic weight of nitrogen
• The maximum number of electrons that can fit in an f sublevel
• Group 14 elements in the periodic table.

Astronomy[edit]

• Messier object M14, a magnitude 9.5 globular cluster in the constellation Ophiuchus
• The New General Catalogue object NGC 14, a magnitude 12.5 irregular galaxy in the constellation Pegasus

In religion and mythology[edit]

Christianity[edit]

• According to the Gospel of Matthew "there were fourteen generations in all from

Abraham to David, fourteen from David to the exile to Babylon, and fourteen from the exile to the Messiah". (Matthew 1, 17)

• The number of Stations of the Cross observed by some Christian denominations.
• The Fourteen Holy Helpers were a group of saints formerly venerated together by Roman Catholics.

Islam[edit]

• The number of Muqattaʿat in the Quran.
• Significant for Twelver Shia Muslims who follow the Fourteen Infallibles.

Hinduism[edit]

• The number of years of Rama's exile in the forest with Sita and Lakshman. ^[5]

Mythology[edit]

The number of pieces the body of Osiris was torn into by his fratricidal brother Set.

The number of sacrificial victims of the Minotaur.

Age 14[edit]

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• 14 is the earliest age that the emancipation of minors can occur in the U.S.
• Minimum age a person can purchase, rent, or buy tickets to a 14A rated movie in Canada without an adult. Ratings are provincial, so ratings may vary. A movie can be 14A in one or some provinces and PG in other provinces. A movie can also be rated 14A in one or some provinces and 18A in other provinces. Quebec has a different rating system for films.
• Youngest age in Canada a person can watch a 14+ rated show without consent from a legal guardian.
• The U.S. TV Parental Guidelines has a rating called "TV-14" which strongly recommends parental guidance for children under the age of fourteen watching the program.
• Minimum age at which one can view, rent, purchase, or buy tickets to an 18A rated movie with an accompanying adult in the Canadian provinces of the Maritimes and Manitoba.
• Minimum age at which one can work in many U.S states. Parental consent may be required, depending on the state.
• Minimum age at which one can drive a vehicle in the U.S. with a driver's license (with the supervision of an adult over 18 years of age, and with a valid, unmarked driver's license, and at least 365 days of experience driving an actual automobile)
• The minimum age limit to drive a 50cc motorbike in Italy.
• The most common age of criminal responsibility in Europe.^[6]
• In some countries, it is the age of sexual consent.

In sports[edit]

• In American football, the National Football League playoffs have involved 14 teams since the 2020 season.
• In golf, a player can have no more than 14 clubs in the bag.
• In rugby union, the starting right wing wears the 14 shirt

In other fields[edit]

Fourteen is: